any good place that custom does white dress shirts ? i only have one which i use when i wear my suit...but its still too short

and around the neck line its getting dirty (ew i know lol)
im just looking for a place that either sells decent quality ones or a place that custom makes em for you ? im 6'6 and i have long arms so its really hard for me to walk into a store (like moores, tip top) and just find a decent white shirt
TIA